Broaching-machine attachment for splitting piston-rings.



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' APPLICATI-)N FILED 2. 1918. 1,292,219, Patented Jan. 21, 1919. i V 3 SHEETS-SEEN' l.

9% Mmmm In nnununul m nun f M. l. ACTON. BROACHING MACHN N TTACHMENT FOR SPLITTING PISTON RINGS.

APPLICATIQN, FILED MAY 2.1918. 1,292,219.

Patented 3111.211919.

3 SHEETS-SHEET 2.

Be it known that .UNITED s'rATEs PATENT carica.

MICHAEL' J. AcTgN,

F FRAMINGHAM, MASSACHUSETTS, ASSIGNOR TO LAPOINTE MACHINE'TOOL COMPANY,I OF HUDSON, MASSACHUSETTS, A CORPORATION" OF MASSACHUSETTS.

Specification of Letters atent.

Patented Jan. :1919.

Application led May 2, 1918. Serial No. 282,128.

To all whom'z't may concern:

I, MICHAEL J. AoroN, a citizen of the United States, residing at Framingham, inthe county of Middlesex and State of Massachusetts, have invented 'a new and useful Broaching-Machine Attachsary complementary wings.

. on the line gearing; F ig. 3 is an enlarged viewf illustrating the lIi() ment for Splitting Piston-Rings, of which the following is a specification. The object of this invention is to provide a new and improved broaching machine at tachment for splitting piston rings.

Piston rings are commonly made out of rings of iron and then are split so as to have engaging end `faces. A common form of piston ring is that which has opposing wings which mesh against each other when the piston ring is compressed.

The object of this invention is to provide an attachmentby which a plurality of piston rings ob] ect 1s provided by arranging a mechanism so, that a plurality of Vpiston rings can be clamped concentrically in position, and by providing guiding means so that an outer broach'ing tool andan inner broa'ching tool can be engaged with the bunch of piston rings simultaneouslyl to make complementary cuts part way through the piston rings, which cuts will come together so as to leave the ends of the piston rings with the neces? The operation is such that a -pluralityofpiston rings will be rapidly severed with a clean overlapping split.

Referring to the accompanying three sheets of drawings, forming part of this application,

Figurell is a planview of a broaching machine with my invention applied thereto;

Fig. 2 is a partial sectional elevation taken 2-2 of Fig. 1, illustrating the attachment;

Fig/tis an end elevation thereof; Fig. 5 is a view similar to Fig. 4 with vthe locking plate removed;

Fig. 6 isa cross sectional elevation;

Fig. 7 is an enlarged view illustrating the clamping blocks for holding the rings;

the way the cutters ing the broaching tools or ing can be split. by two complementary cuts, preferably made at the same time. This to the other by any 28 1s engaged by a yoke 33"connec`tej Fig. 8 is an enlarged end view illustrating Fig. 9 is an end view illustrating the cuts made in the piston rings;

Figs. 10 and 11 are a sectional view and an endelevation respectively of the upper member; l f

Figs. 12 and 13 are a sectional view and an end elevation res ectively of the lower member or work support; v

Fig. 1 4 is an end elevation of they adjustable gib mechanism for adjustably positioncutters;

Fig. 15 is a side elevation of the 4lower supporting block;

Fig. 16 is an end elevation of the lockplate; Flg. 17 is an. end view of one'of the split piston rings, and

1g. 18 is a side elevation' onreduced scale engage the piston' rings;

This breaching machine consists of a suitable frame or support'journaled' in which is a driving shaft 20 on which are arranged the usual tight. and loose pulleys so that power can be imparted to the machine by a belt shifted fromV one pulley belt, and the belt shifter of approved form.

On shaft 20 is arranged a pinion 21 which meshes with a large driving gear 22 which has clutch teeth 23. Also arrangedon the driving shaft 2 0 is a inion 24Wh1ch meshes through an interme iate25 with a reverse ,gear 26 having the female member 27 i of a friction clutch. A sliding clutch 28 having teeth 29 opposed to the-clutch teeth 23 and a cone 30 opposed to the'meinbei- 27 is keyed j on a nut 31 arrangedfon the drivingorpull- "ing screw 32 which passes through thc d rivgears 22 and 26. "The clutch ing and reverse .vien arm "34 to a shifting rod 35, havin adj'iistable tappets 36-36. The end of thefilling screw 32 is connected is mounted on suitabl work, and which has a coupling orclampto fa carriage; which eways'in the frame- Y handle 39 is journaled in the frame and attached by suitable connections to the shift- 52 ing rod 35.-

teeth 29 of the clutch 28 will be 'engage with. the clutch teeth 23 on the driving gear '22, and the nut 31 pulling or drawing screw 32 to draw the same to the righty and .thus give the power stroke to the machine. This motion will continue. until the righthandtappet is engaged by anarm 40 extending from the carl riage, when the vclutChteeth will be disenaged and the motion stopped. The handle 39i's then thrown to the right which willengage the cone 30 with the .member 27 so that i power will be imparted to thenut 31 through the pinion 24, intermediate 25 and reverse ear 26, which will Arevolve the nut 31 raplidly in reverse direction and give the ca r'- riage 37 a quick return movement.` This returnv movement'J will continue until the carriage arm 40 engagesthe left-hand vtappet, ywhen the conical clutch will be thrown out of engagement. l

The parts previously describedl constitute an improved form of broaching machine to lwhich my invention can be applied. `The ower movement of the broaching tools is at V-slow speed to the? right as illustrated, and the left-hand movement of the broaching tools-is a quick return movement. l will 35 now describe the attachment which consti- -'tutes my present invention.

The face or end plate of the vmachine is designated by 50, and the same has a hole therethroughl A designates the upper member of my attachment. This member` has a circular head 51v having a projecting hub 52 whichA fits into the `hole in thevface plate, the head Lbeing secured to the face plate yby screws 534-53. Projecting from i the head 51 is arectangular-shaped section 4Qhavinga groove 55 along its lower suraceldesignates theA lower member'orwork .support of my attachment. The sameh'as a partial Circularhead 56 .which bears on the v head 51 of th ypart A and which'is held thereto by screws 57, five being shown yas employed for this purpose. Extending fromthe upper part-of the head 56` is a recvtangu 58 which has a tenen or lar Section projection `59 adapted to, fit into the groove 55 of the section 54 of the member A. The

the' piston rings in place.`

two sections `54and 58 are held together 'by screws 60.. A groove'l is formedon the under` side of the section 58 and a smaller groove 62 is cut in the top of the groove 61, `j thetop of this smaller groove being incline as-shown at 63.

'Fitting in the groove 62 is a tapered gib 2 65 E or key 64 which can be adjusted longitudi1 ing a notch in the end of When the handle is thrown to the left, the I d v by the gib 64 thel relation of the upper cutwill be revolved on the '54 and 58and engage the blocks 66 and 67 4has a groove 70 cut in 44fitting therein is a tapered gib7 6 which can ysition without with d tapered as at so that'the nally by means of .a screw 65 threaded inthe sect1on54, which screw has a collar engagthe gib. The upper cutting tool C is fitted in the groove 62, which thus forms guiding means therefor, and by adjusting the screw 65 and thereting tool to the piston rings can ,be very accurately adjusted.

Fitting in the groove 6 1 are clamping4 blocks 66 and 67 which clamp the piston rings in place, and which together with'the upper cutting tool C .'ill up the groove 61., Two screws 68 are threaded in the sections 'for clamping purposes. Also extending from the head 56 of the member B is a partial circular hub vor worlisupport 69 which its upper face. A In the bottom of this groove are screws 71--71 85' and also a vclamping and supporting block 72 which has a tenon 73 adapted to fit into the groove 7.0. This clamping block 72 has a groove 74 in the upperpart of the same, the lower wall of which7 5 is inclined, andbe accurately adjusted by a 'screw 7 7 which has a collar .fitting into a notch in the gib. The lower cutting tool D works in the groove 74 which thus orms lguiding meansV therefor,.and its relation to` rings can screw 77.

The opposin the work or piston x faces of' the .clamping blocks 66, 67 and 72 are made circular as 100 indicated 1n Fig. 7 so that the piston rings can be accurately clamped in Aposition by tightening 'the screws. 68. A spacing `ring. 78 may be hung von'the right-hand endof` the lowerclamping block 72 if desired. 105 This spacingringis made inthe shape of the completed plston ring, -as shown in Fig; 17.

vA locking plate 79 is held -to the section 54 of the member A by lower member B. The holes 82 through the locking. plate through'which the screws 80 and" 81 pass are made oiset in shape as shown in Fig. 16, so that the locking plate can be placed in position' over the heads of locking plate can be iut into and out'of pw r and 81. Two clamping screws '83 are threaded into the locking plate 79 to clamp 4The lowerv engaglng edge of the locking plate-7 9 is made slightly tapered as at 84, and the outer end of 'the hub 69 is correspondingly slightly can be very accurately engaged 4in positlong The operatlon is as follows: The -ma4a4 chine is stopped with `the breaching or cut- 130 be accurately adjusted by th-e two screws 80 ,and 110.v `by av screw 81 to the work support69`of the awing the yscrews 80 1'2'() locking plate This will simultaneously held accurately ent isting tools in their left-hand position. The locking plate 79 is removed and a bunch of piston rings P, say thirty or forty, are slipped into" the mach-ine over the broachin tools on to the work su port 69 and between the clamping blocks 2, 66 and 67. The locking plate is then secured in position, and the clamping screws 83 lightly adjusted. At the same time the screws 71 are tightened, whereby the bunch of piston rings will be in vposition between the clamping blocks. The clamping screws 83 may be given a fmal turn if desired. The spacing ri 78 may or may not be employed. This will support the plurality of piston rings concentrically in position.

vThe machine is then started in operation. draw the upper and lower broaching tools or cutters C and D into the machine between the clamping blocks. The broaching tools are shown articularly in Fig. 18. .Each tooth of the tool has an extending nose-,86 and a flat portion 87. The extending portions 86-86 come back to back as illustrated'and will cut only part way into the rings. This will make complementary cuts in the sultmg in a clean overlapping split, which will leave each piston ring with an extending complementary wing 88, whereby the ends of the rings. can be sprung together as indicated in dotted lines in Fig. 9 when in use. By using diii'erent size clamping blocks, piston rings can be split.

The broaching tools employed comprise two complementary cutter bars each having a series of teethl adually increasing in height so as to maiz successive cuts. The shape of these teeth and the number thereof of course can be varied to suit different jobs. By adjusting the tapered gibs before described, the depth of the complementary cuts made in the piston rings can be very accurately determined.

One attachment, therefore, is capable of doing a great variety of work. By splitting the piston rings bythe use of complementary cutting tools or cutter bars so that one tool is cutting on' the inside surface while the other is cutting on thc outer surface, the work is very rapidly andaccurately done.

Modifications of the invention or attachment herein shown and described may be made by a skilled mechanic without departing from the scope of my invention as defined in the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Pat- 1. An attachment for broaching machines, comprising means for supporting a plurality of piston rings, guiding means for supporting and guiding a broaching tool outside of piston rings, re'

of' different diameters las to leave grooves said piston rings, and guiding means for supportingand guiding abroaching tool inside of said piston rings. l

2. An attachment forbroaching machines, comprising means for supporting a yplurality of piston rings, guiding means for supporting and guiding a broaching tool outside of said piston rings, guiding means for sup# portin and guiding a broaching tool inside of saig piston rings, and means for simultaneously drawing two broaching tools past said rings.

3. An attachment for broaching machines comprising means for supporting a plurality of piston rings concentrically inA position, two broaching tools and means for simultaneously drawing one broaching tool over the rings and the other broaching toolthrough thesame, said broaching tools being shaped to make complementary cuts in' piston rings, whereby the piston rings e severed but will have complementary the will 4. broaching machine attachment comprising a work support, means for clamp- 90,

v lng a plurality of piston rings thereon, guiding means outside of said piston rings for supportin a broaching tool, guiding means inside sai piston rings for supporting another broaching tool, and means for simul` taneously moving two broaching tools to make opposed complementary cuts.

' broaching machine attachment comprising a projection or support having clamping blocks therein, a work support having a supporting block thereon, the space between the outer clamping blocks forming a guide for a broaching tool, and the lower supporting block having a groove for a broaching tool, and means for simultaneously drawing two broaching tools through said grooves to makecoinplementary cuts in the piston rings.

6. A broaching machine attachment coniprising an upper member having a projection, a lower member having a projection and an extending work supporting hub, clamping members iitted in. tlie projection and work support of the lower member so as to leave grooves, and adjustable gibs fitting in the bottom of said grooves.

7. A broaching machine attachment coniprising an upper member having a projection, a lower member having a projection and an extending work supporting hub, clamping members fitted in the projection and work support of the lower member so for the cutter tools, and means for clamping al plurality of piston rings in place comprising alocking plate detachably secured tothe end of the structure and clamping screws therein.

8. A broaching machine attachment comprising an upper member having a projection, a lower member having a projectioii'130 4 kand an extending 'clamping members work supporting hub, fitted in the pro1ection and work support of the lower member so as to leave grooves for the cutter tools, and

5 means for clampinga plurality of piston rings in place comprlsing a. clamping plate v detachably secured to the end yof the vstrue- MICHAEL J. ACTQN. 

